Final answer:
The strategy used by public health to reduce the incidence of flu is hygiene education.
Step-by-step explanation:
The strategy used by public health to reduce the incidence of flu is Hygiene education. This involves teaching individuals about proper handwashing techniques, covering their mouth and nose when coughing or sneezing, and practicing good respiratory hygiene. By promoting these hygiene practices, public health aims to prevent the spread of the flu virus and ultimately reduce the number of new cases.
Learn more about Public health strategies to reduce flu incidence